50. It's how men wish it to be

That science favors them. They are always sexually attractive and women lose that. My scientific observation is that I find 20 somethings more attractive generally than oldies. We are not looking for old rich men in preference to youths with six packs.

This is especially so since the sexual revolution, when women stopped staying in their place as men had assigned it. No more Victorian 18 year olds marrying 40 year old men - an older man who gets a younger woman is only going to be one who stayed in shape and was good looking to start.